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 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
 * with the License.  You may obtain a copy of the License at   *
 * *
 * http://www.apache.org/licenses/LICENSE-2.0                 *
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 * Unless required by applicable law or agreed to in writing,   *
 * software distributed under the License is distributed on an  *
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package org.apache.james.eventsourcing

object Event {
  def belongsToSameAggregate(events: Iterable[_ <: Event]): Boolean = events
    .toSeq
    .view
    .map(event => event.getAggregateId)
    .distinct
    .take(2)
    .size == 1
}

trait Event extends Comparable[Event] {
  def eventId: EventId

  def getAggregateId: AggregateId

  def isASnapshot: Boolean = false

  override def compareTo(o: Event): Int = eventId.compareTo(o.eventId)
}

trait ImmutableState

object EventWithState {
  def noState(event: Event): EventWithState = EventWithState(event, None)
}

case class EventWithState(event: Event, state: Option[ImmutableState])